Update ICU to 58.1

source/data/zone/gd.txt

Index: source/data/zone/gd.txt
diff --git a/source/data/zone/gd.txt b/source/data/zone/gd.txt
index c8e9aa529518478c47dfb94bf1ce728557011f1d..55fc793ee273806568bbcfe548f3a56af8aef358 100644
--- a/source/data/zone/gd.txt
+++ b/source/data/zone/gd.txt
@@ -1,13 +1,7 @@
-// ***************************************************************************
-// *
-// * Copyright (C) 2015 International Business Machines
-// * Corporation and others. All Rights Reserved.
-// * Tool: org.unicode.cldr.icu.NewLdml2IcuConverter
-// * Source File: <path>/common/main/gd.xml
-// *
-// ***************************************************************************
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html#License
 gd{
-    Version{"2.1.20.4"}
+    Version{"2.1.28.76"}
     zoneStrings{
         "Africa:Abidjan"{
             ec{"Abidjan"}